Impact of frailty on outcomes of elderly patients undergoing percutaneous coronary intervention: A systematic review and meta-analysis

Table 3 Quality of included studies

Ref.	Selection				Comparability	Outcome			Total
	Representativeness of the exposed cohort	Selection of the nonexposed cohort	Ascertainment of exposure	Demonstration that outcome of interest	Basis of the design or analysis	Assessment of outcome	Follow-up long enough for outcomes	Adequate follow-up
Shimono et al[13], 2023	0	1	1	1	1	1	1	1	7
Özbek and Balun[14], 2023	0	1	1	1	1	1	1	1	7
Mangale et al[15], 2023	0	1	1	1	1	1	1	1	7
Noike et al[16], 2023	1	1	0	1	1	1	1	1	7
Heaton et al[17], 2023	1	1	1	1	2	1	1	1	9
Borovac et al[18], 2022	1	1	0	1	1	1	1	1	7
Kanwar et al[19], 2021	1	1	1	1	1	1	1	1	8
Kurobe et al[20], 2021	1	1	1	1	1	1	1	1	8
Kanenawa et al[21], 2021	1	1	1	1	1	1	1	1	8
Nishihara et al[22], 2021	0	1	1	1	1	1	1	1	7
Kwok et al[23], 2020	1	1	0	1	1	1	1	1	7
Yoshioka et al[24], 2019	1	1	0	1	1	1	1	1	7
Nguyen et al[25], 2019	1	1	0	1	1	1	1	1	7
Damluji et al[26], 2019	0	1	1	1	1	1	1	1	7
Herman et al[27], 2019	1	1	1	1	1	1	1	1	8
Calvo et al[28], 2019	1	1	0	1	1	1	1	1	7
Batty et al[29], 2019	1	1	1	1	1	1	1	1	8
Dodson et al[30], 2018	1	1	1	1	1	1	1	1	8
Patel et al[31], 2018	1	1	1	1	1	1	1	1	8
Sujino et al[32], 2015	1	1	1	1	1	1	1	1	8
Murali Krishnan et al[33], 2015	1	1	0	1	1	1	1	1	7